brython.js version >= 3.7.x is not working

[kikocorreoso]

Since Brython version >= 3.7.x I'm getting the following error:

ReferenceError: $locals___main__ is not defined
    <anonymous> brython.js:4
    _run_scripts brython.js:4911
    brython brython.js:4758
    <anonymous> Brython usage in the IPython notebook-Copy1.ipynb:1
    jQuery 3
    _safe_append outputarea.js:459
    append_display_data outputarea.js:666
    append_output outputarea.js:346
    handle_output outputarea.js:257
    output codecell.js:399
    _handle_output_message kernel.js:1198
    i jQuery
    _handle_iopub_message kernel.js:1238
    _finish_ws_message kernel.js:1017
    _msg_queue kernel.js:1008
    promise callback*Kernel.prototype._handle_ws_message kernel.js:1008
    i jQuery
    start_channels kernel.js:517
    _kernel_created kernel.js:412
    on_success kernel.js:317
    _on_success kernel.js:380
    jQuery 6
    ajax utils.js:797
    restart kernel.js:332
    restart_and_resolve notebook.js:2408
    click notebook.js:2435
    jQuery 10
    modal dialog.js:95
    _restart_kernel notebook.js:2439
    restart_kernel notebook.js:2394
    handler actions.js:127
    <anonymous> actions.js:917
    call actions.js:1019
    fun toolbar.js:116

So brython versions >= 3.7.0 could not be used at this moment.

[PierreQuentel]

Hi Kiko,

For a basic script such as

print("ok")

Brython generates this code:

var $B = __BRYTHON__;
var _b_ = __BRYTHON__.builtins;
var $locals = $locals___main__
$locals___main__.__package__ = ""
$locals.__annotations__ = $B.empty_dict()
var $top_frame = ["__main__", $locals___main__, "__main__", $locals___main__]
$locals.$f_trace = $B.enter_frame($top_frame)
var $stack_length = $B.frames_stack.length;
try{
    ;$locals.$line_info = "1,__main__";if($locals.$f_trace !== _b_.None){$B.trace_line()};_b_.None;
    $B.$call(_b_.print)("ok");
    $B.leave_frame({$locals, value: _b_.None})
}
catch(err){
    $B.leave_frame({$locals, value: _b_.None})
    throw err
}

In the third line, the code needs a reference to $locals___main__. In the Brython execution environment, this variable is initialized to an empty Javascript object. Here is a simplified version:

var $locals___main__ = {}
eval(js_code)

I suppose that setting this value in the brythonmagic environment would remove the error message.

[kikocorreoso]

Thanks @PierreQuentel

I would give a try!!!!

Thanks for helping on this.

Salut!!